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Feng, Z.Q.

Paper Title Page
TUPEA052 DLLRF and Beam Trip Analysis in the Storage Ring of SSRF 1449
 
  • X. Zheng, H.T. Hou, J.F. Liu, C. Luo, Zh.G. Zhang, S.J. Zhao
    SINAP, Shanghai
  • Z.Q. Feng, Z. Li, D.Q. Mao, Y.B. Zhao, X. Zheng
    Shanghai KEY Laboratory of Cryogenics & Superconducting RF Technology, Shanghai
  
 

The digital low level radio frequency (DLLRF) system and the beam trip diagnostic system in the storage ring of Shanghai Synchrotron Radiation Facility (SSRF) have been operational for more than one year. The DLLRF has successfully maintained the amplitude and phase stability of the cavity field in the superconducting cavity even when the beam current in the storage ring reached 300mA at 3.5GeV, and the beam trip diagnostic system has been realized and is helpful for improving the reliability of the RF system.

  
WEPEA047 Operation of SRF in the Storage Ring of SSRF 2594
 
  • J.F. Liu, H.T. Hou, C. Luo, Zh.G. Zhang, S.J. Zhao
    SINAP, Shanghai
  • Z.Q. Feng, Z. Li, D.Q. Mao, Y.B. Zhao, X. Zheng
    Shanghai KEY Laboratory of Cryogenics & Superconducting RF Technology, Shanghai
  
 

The superconducting RF system has been operated successfully in the storage ring of SSRF since July, 2008. The superconducting RF modules integrated with 310 kW transmitters and digital low level radio frequency (LLRF) control are adopted to provide about 4.5 MV cavity voltages to 3.5GeV electron beam. The operation status of SRF system is mainly reported here, the problems we met are analyzed, and the operation with normal conducting cavity systems is introduced briefly. The challenge for us is to improve the system reliability and machine performance.

  
WEPEA050 Studies on Higher Order Modes Damper for the 3rd Harmonic Superconducting 2600
 
  • H. Yu
    SSRF, Shanghai
  • M. Chen, Z.Q. Feng, H.T. Hou, J.F. Liu, Z.Y. Ma, D.Q. Mao, B. Yin
    SINAP, Shanghai
  
 

To investigate the higher order mode(HOM) damping in the higher harmonic cavity for Shanghai Synchrotron Radiation Facility(SSRF) when using HOM absorbers,simulations have been done for changing the position and the length as well as the thickness of ferrite of HOM damper. The best values under which the Q value of HOMs can be greatly lowered and the impedance of harmonic cavity will be trapped in the impedance threshold have been found.